Peripheral pump



R. V. COOK PERIPHERALPUMP Filed Feb. 26, 1940 March 24, 1942.

INVEINTORI. g

ROBERT V. COOK BY @wvzlwat/ ATTORNEY.

; Patented M51. 24, 1942 UNITED STATE s PATENT .OFFlCE PERIPHERAL PUMPRobert V. Cook, Chicago, 111., as slgnor to Fairbanks, Morse & Co.,Chicago, 111,, a corporation of Illinois ,Application February 26, 1940,Serial No. 320,734

10 Claims.

sitating any disassembly of the remainder of the pump assembly.

The principal object of the invention then resides in the provision ofimproved sealing means for the purpose indicated, characterized bycoacting, substantially cylindrical seal plugs, each having a shoulderedend, the plugs being non-rotatably seated in transverse recesses formedin the pump casing between the inlet and discharge passages. thereof,and being arranged in opposed relation such that the shouldered endsabut and cooperate to form a groove or slot closely receiving theperipheral portion of the impeller.

Another object resides in the provision of improved impeller seal plugsarranged in cooperating, opposed relation transversely of the pumpcasing and on opposite'sides of the impeller, such that the plugs may bereadily and easily assembled to or removed from the casing withoutdisturbing the remainder of the pump assembly.

'A further object appears in the provision of renewable seal plugs forthe purpose indicated, of improved construction and so mounted in thepump casing as to facilitate assembly and adjustment thereof, to providea more efiective and efilcient impeller sealing function of the plugsrela-'- tive to the pump impeller, than has been ob tained heretofore.

Further objects and advantages will appear as the following descriptionproceeds and when taken in connection with the accompanying dra-w-' ing,in which:

Fig. i is an assembly elevation of a peripheral type pump incorporatingimpeller seal plugs according to the present invention, a portion of thepump casing being broken away to reveal the seal plug assembly, partlysectioned as shown; and Fig. 2 is a greatly enlarged, fragmentarysection transversely of the pump casing, showing the preferred type ofimpeller-seal means in operative position, the view being taken alongline 22 of Fig. l.

Referring to the drawing by suitable characters of reference, theperipheral pump assembly illustrated, includes a casing section it?provided with a mounting standard H and an upper L-shaped extension l2providing fluid inlet and discharge passages later to be indicated, anda'complementary' casing section I3 removably secured to the section. H)as by suitable bolts or cap, screws Id. The casing sections in assembly,provide an annular impeller chamber or channel, as indicated at 85, inwhich rotates the bladed peripheral portion l6 of a disc type impelleror pump rotor 51; The impeller is secured by a suitable key i8, upon theinner end of a pump shaft is,

, the shaft being suitably journalled (not shown) in the casing sectionit and projecting outwardly thereof (not shown) for coupling to a pumpoperating motor or other prime mover.

As appears in Fig, 1, the portion 20 of the easing extension 92,provides a fluid inlet passage 2! in communication with the pump chamber55 and the impeller therein, while. the extension portion 22 provides afluid outlet or discharge pas.- sage ,23 for the casing chamber 55. Thetwo passages are separated by a dividing wall 25,

preferably formed integrally with the casing structure, the dividingwall being extended into 7 the impeller channel 55 to provide atransverse barrier therein, with the lower end 25 of the wall overlyingthe impeller periphery, as shown in Fig. 1.

In order to prevent an undesirable by-pess movement of fluid from thedischarge passage to the inlet or suction passage of the pump, be-

tween the impeller periphery and the lower end I 25 of the barrier orbridge 25, the prevailing practice has been to employ a separate sealingmeans at the bridge zone, having a minimum clearance with the impellerperiphery. However, such sealing members as have beenutilized'heretoiore for this purpose, have not been accessible foradjustment, repair or replacement without necessitating disassembly ofthe pump casing.-

Accordingly, in keeping with the purposes hereinbefore stated, thearrangement provides a markedly eilective sealing means so arranged inthe pump assembly as to be fully accessible from the exterior of thepump casing, thus avoiding the objections noted hereinabove.

Fig. 2 illustrates the preferred form and arrangement of sealing meansaccording to the present invention, located in the zone of the bridge 25as shown in Fig, 1. Formed on the casing in is an external lateral boss28, and extending laterally through the boss and casing is an apertureor bore 21. The casing portion of the bore is smooth-walled for thereception of a cylindrical seal member or plug 28,. while the portion ofthe bore in the boss 23 is internally threaded to receive a threaded setscrew 33, the inner end 33 of which normally abuts the plug 28. Thecasing section I 3 is similarly externally bossed, as at 3|, and isprovided with a like bore 32 adapted for the reception oi a second plug33 and set screw 33, the casing bores 21, 32 and seal-plugs 33, 33 beingin axial register in the pump assembly, as shown in Fig. 2. The inneropposed ends of the plugs 23 and 33 are formed to provide shoulderedrecesses, as at 33 and 33 respectively, which in the assembly abutment01' abutting ends may be dressed down and the recesses 33 and 33machined so that the desired rotor clearance will be again established.

The foregoing description of an improved type of sealing means adaptedfor application to a peripheral pump, relates to a single preferredembodiment thereof, and it is to be understood that the present sealingmeans is susceptible of various structural and assembly modificationswiththe plugs as shown in Fig. 2, cooperate to provide a recess orgroove 31 to receive or embrace the peripheral, fluid-impelling portionof the pump impeller. The plug recesses 35 and 33 may be accuratelymilled and machined to provide for the desired minimum operatingclearance or running seal for the impeller. As appears in Fig, 1, thelateral aperturing o! the casing sections to receive the seal plugs, iseffected in the zone of the bridge 23, such that the lower end 25 of thebridge is thereby cut away in arcuate form, as at 33, to accommodate theprojecting shoulders 39 of the seal plugs (Fig. 2) so that theseshoulders may abut in assembly, in overlying relation to a definite,limited arc of the impeller periphery. The assembly abutment oi. theplug shoulders 33 then determines the sealing position of the plugsrelative to the impeller, such as to maintain the miniminn operatingclearance or running seal therewith. The plugs are retained in suchposition by the set screws 23 and 33, and the latter are held or lockedin adjustment. each by a lock nut 43 which in the present example, maybe formed toprovide an enclosing cap 4|. A suitable gasketing washer 32may be provided as shown, to preclude fluid leakage at the juncture ofthe cap and casing.

To assure proper seating of each plug and further, to prevent rotationaldisplacement thereof.

in the casing hore, key-ways and 43 are formed in the plug and easingrespectively, to receive a key element 43.

Thus while prevented from turning by reasonof the keys 45, the plugs maybe readily displaced in the axial direction, as for face of theimpeller, provides for readyinser- Y operable in said channel, and fluidsealing means in the zone of saidchannel between said passages, saidmeans comprising laterally adjustable cooperating elements carried bythe casing and close embracing the periphery of the rotor in said 0 elzone.

2. In a fluid pump of the general type described, a casing providing anannular fluid channel and inlet and outlet passages communicatingtherewith, a rotor member of peripheral fluid-impelling type. operablein said channeL-a partition separating said passages and projecting intosaid channel, to overlie said rotor,- said casing being aperturedlaterally therethrough in the zone of said partition,- and cdoperatingfluid sealing elements seated in said aperture, said elements closelyoverlying the rotor periphery and extending closely adjacent the,opposite lateral faces of the rotor in the peripheral zone thereof.

3. In a fluid pump of the general type described, a casing providing anannular fluid tion and assembly seating of the plugs after assembly ofthe pump, and thereby enables adjustment of the plugs from the exteriorof the casing, through the set screws 29 and 33 as rendered accessibleupon removal of the capsign of wear or erosion in the pumping channelappears at the bridgeor partition portion 23, for at this point thefluid mass must be diverted into the outlet e 23, and eiiectivelyprevented from passing on into the inlet side of the pump. Therefore,the sealing means at this point or zone must be capable of readyadjustment as to operating clearance. The plug type of sealing meansabove described is well adapted for this purpose, since in the presentlyimproved arrangement thereof, they may be readily adjusted or removedand replaced without disturbing or requiring disassembly of, theremainder of the pump. And since the plugs are small and inexpensive,they may be discarded ii badly eroded,

and new ones inserted, or it slightly worn, the

channeland inlet and discharge passages communicating therewith, a pumprotor of peripheral fluid impelling type, operable in said channel, apartition separating said passages and extending into said channel inoverlying relation to said rotor, said casing being apertured laterallytherethrough in the zone or said partition, opposed fluid sealingelements removably seated in said aperture on each side of said rotor,said elements closely embracing the rotor periphery in the zone of saidpartition, and means for retaining said elements in position in saidaperture. I

4. In a fluid pump of the general type described, a casing providing anannular channel and adjacent inlet and discharge passages communicatingtherewith, a pump rotor of peripheral fluid impelling type, operable insaid channel, said casing being apertured transversely therethrough inthe zone of the channel between said pes, opposed fluid sealing elementsseated in said aperture, the inner opposed ends of said elements closelyembracing the rotor periphery in said channel zone, and means forretaining said elements inposition in said aperture, said elements andretaining means being accessible from the exterior of said casing. 5. Ina fluid pump of the general type described, a casing providing anannular fluid channel and adjacent inlet and discharge passages incommunication therewith, a pump rotor oi. peripheral fluid-impellingtype, operable in saidchannel, said casing being apertured transverselytherethrough in the zone of the channel between said passages, fluidsealing elements seated in said aperture on'opposite sides of saidchannel, the inner opposed ends of said elements ture for retaining saidelements in position there.-

in, said elements and retaining means being accessible mm the exteriorof said casing.

6. In a pump of the general type described, a casing provided with adisplacement channel along its interior periphery, an impeller having adisplacing portion operable in said channel, the casing being formed toprovide spaced inlet and discharge ports and conduits, a sealing elementin the casing, between the zones of the ports, the sealing element beingdisplaceable in a direction transverse to the impeller, and formed onits inner end to constitute a running'seal with one side and the rim ofthe impeller, and a cooperating abutment portion carried by the casingand coactingwith the sealing element.

7. In a pump of the general type described. a

casing provided with a displacement channelner end to constitute arunning seal with one side and the rim of the impeller, and a second.

companion sealing element, adjustable to and from the impeller rim,carried by the casing and coacting with the sealing element.

8. In a pump of the general type described, a casing provided with adisplacement channel along its interior periphery. an impeller having adisplacing portion operable in said channel, the casing being formed toprovide spaced inlet and in the casing, betweenthe zones of the ports,the sealing element being displaceable in a direction transverse to theimpeller, screw threaded means for displacing the said sealing element,said sealing element being formed on its inner end to constitute arunning seal with one side and the rim of the impeller, a cooperatingabutment portion carried by the casing and coacting with the sealingelement, and means for preventing rotational displacement of the sealingelement.

9. In a pump of the general type described, a casing provided with adisplacement channel along its interior periphery, an impeller having adisplacing portion operable in said channel, the casing being formed toprovide'spaced inlet and outlet, ports and conduits, a sealing elementin the casing, between the zones of the ports, the sealing element beingdisplaceable in a direction transverse to the impeller, screw threadedmeans for displacing the sealing element, said screw threaded meansbeing accessible from the exterior of the casing, a sealing capconstituting a cover overlying the screw threaded means, said dischargeports and conduits, a sealing element sealing element being formed onits inner end to constitute a running seal with one side and the rim ofthe impeller, and a cooperating abutment portion carried by the casingand coacting with ment to and from the impeller in a direction parallelto the impeller axis, the said plug having an arcuately undercut portionnear its inner end, adapted to constitute a running seal with one sideand the outer edge of the impeller rim.

' ROBERT V. COOK.

